大洋有孔虫中硼同位素研究与大气pCO_2的重建

大气二氧化碳浓度(pCO2)的变化在全球气候演化中起着重要的调节作用,重建古大气pCO2的变化历史,有助于预测和研究未来的全球气候变化。大洋有孔虫中的硼同位素比值能够反映海水酸碱度的变化,从而为重建大气二氧化碳浓度的变化历史提供了一种新的手段。文中首先简要回顾硼同位素的研究现状,利用硼同位素重建大气二氧化碳浓度变化的原理依据,在此基础上,测试分析了西赤道太平洋806孔全新世和末次冰期最盛期Globigerinoides ruber样品中的硼同位素,得到该地区全新世和末次冰期最盛期大气二氧化碳体积分数分别为(276.7±24)×10-6(2s.d.)和(178.4±16)×10-6(2s.d.),与极地冰心记录吻合得很好。大洋有孔虫中的硼同位素是一个非常有潜力的古海水酸碱度替代指标。

Marine foraminiferal δ~(11)B and reconstruction of atmospheric pCO_2

Atmospheric pCO2 regulates the global climates on both short-and long-term timescales. Knowledge of evolution of atmospheric pCO2 in the past would provide a potential possibility to predict changes in the future. An increasing number of studies have shown that marine foraminiferal δ11B has great potential to be a reliable palaeo-pH proxy, hence, allows reconstructions of the atmospheric pCO2. In this paper, we firstly reviewed on the boron isotopes in marine foraminifers, as well as the basis of the boron ...